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1) what structures/properties of the heart prevent spatial summation? 2)what structures/properties of the heart prevent tenporal...

1) what structures/properties of the heart prevent spatial summation?
2)what structures/properties of the heart prevent tenporal summation of cardiac muscle?
3) without these how canthe force of the heart contraction be increased? include both neural/hormonal effect as well as intrinsic mechanisms.
Science   Anatomy-And-Physiology   
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